Do not wrap preprocessor lines in the generated JNI.

base/android/jni_generator/jni_generator.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # TODO (qinmin): Need to refactor this file as base should not know about
 # higher level concepts. Currently this file has knowledge about higher level
 # java classes.
 
 """Extracts native methods from a Java file and generates the JNI bindings.
@@ skipping 862 matching lines @@
         'JNI_SIGNATURE': JniSignature(called_by_native.params,
                                       called_by_native.return_type,
                                       True)
     }
     return template.substitute(values)
 
 
 def WrapOutput(output):
   ret = []
   for line in output.splitlines():
-    if len(line) < 80:
+    # Do not wrap lines under 80 characters or preprocessor directives.
+    if len(line) < 80 or line.lstrip()[:1] == '#':
       stripped = line.rstrip()
       if len(ret) == 0 or len(ret[-1]) or len(stripped):
         ret.append(stripped)
     else:
       first_line_indent = ' ' * (len(line) - len(line.lstrip()))
       subsequent_indent =  first_line_indent + ' ' * 4
       if line.startswith('//'):
         subsequent_indent = '//' + subsequent_indent
       wrapper = textwrap.TextWrapper(width=80,
                                      subsequent_indent=subsequent_indent,
@@ skipping 80 matching lines @@
     input_file = options.input_file
   output_file = None
   if options.output_dir:
     root_name = os.path.splitext(os.path.basename(input_file))[0]
     output_file = os.path.join(options.output_dir, root_name) + '_jni.h'
   GenerateJNIHeader(input_file, output_file, options.namespace)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))